Released only a few days ago, the Android 4.3 update is not available as an OTA download for Galaxy S3 owners. Here’s the brief statement Samsung Mobile UK gave to Sam Mobile on the matter:

As we are currently investigating the reported issues with Galaxy S3 4.3 Jelly Bean update, the upgrading service has been temporarily suspended. We are committed to providing customers with the best possible mobile experience, and will ensure to resume the upgrading service at the earliest possibility.

The publication also listed the following major issues with the Galaxy S3 Android 4.3 update:

Wake up lag (Sometimes it takes a few seconds to wake the device from standby and sometimes a few minutes)

The Galaxy Note 2 is also expected to receive its own Android 4.3 upgrade in the near future, with a new test firmware having leaked the other day. However, it’s not clear when the handset will receive the update considering the issues with the Galaxy S models mentioned above.